System and method for pushing information from a host system to a mobile data communication device having a shared electronic address

ABSTRACT

A system and method for pushing information from a host system to a mobile data communication device upon sensing a triggering event is disclosed. A redirector program operating at the host system enables a user to continuously redirect certain user-selected data items from the host system to the user&#39;s mobile data communication device upon detecting that one or more user-defined triggering events has occurred. The redirector program operates in connection with event generating applications and repackaging systems at the host system to configure and detect a particular user-defined event, and then to repackage the user-selected data items in an electronic wrapper prior to pushing the data items to the mobile device. The mobile device and the host system share a common electronic address so that messages generated at either the host system or the mobile data communication device are configured using the common electronic address.

BACKGROUND OF THE INVENTION

The present invention is directed toward the field of replicatinginformation from a host system where the information is normally storedto a mobile data communication device. In particular, the system andmethod of the present invention provide an event-driven redirectioncomputer program (“redirector program”) operating at the host system,which, upon sensing a particular user-defined event has occurred,redirects user-selected data items from the host system to the user'smobile data communication device. The mobile data communication deviceis preferably coupled to the host system via a wireless network and oneor more landline networks. Due to the bandwidth limitations of wirelessnetworks, only a portion of a user-selected data item is generallyredirected to the user's mobile device, with the user given the optionof then retrieving the entire data item (or some other portion of thedata item) from the host system.

Instead of warehousing (or storing) the user's data items at the hostsystem and then “synchronizing” the mobile data communication device todata items stored at the host system when the mobile device requeststhat such items of information be communicated to it, the presentinvention employs a “push” paradigm that continuously packages andretransmits the user-selected items of information to the mobile datacommunication device in response to a triggering event detected at thehost system. Wireless mobile data communications devices, especiallythose that can return a confirmation signal to the host that the pusheddata has been received are especially well suited for this type of pushparadigm.

Present systems and methods for replicating information from a hostsystem to a user's mobile data communication device are typically“synchronization” systems in which the user's data items are warehoused(or stored) at the host system for an indefinite period of time and thentransmitted in bulk only in response to a user request. In these typesof systems and methods, when replication of the warehoused data items tothe mobile device is desired, the user typically places the mobiledevice in an interface cradle that is electrically connected to the hostsystem via some form of local, dedicated communication, such as a serialcable or an infrared or other type of wireless link. Software executingon the mobile data communication device then transmits commands via thelocal communications link to the host system to cause the host to begintransmitting the user's data items for storage in a memory bank of themobile device. In these synchronization schemes, the mobile unit “pulls”the warehoused information from the host system in a batch each time theuser desires to replicate information between the two devices.Therefore, the two systems (host and mobile) only maintain the same dataitems after a user-initiated command sequence that causes the mobiledevice to download the data items from the host system. A generalproblem with these synchronization systems is that the only time thatthe user data items are replicated between the host system and themobile data communication device is when the user commands the mobiledevice to download or pull the user data from the host system. Fiveminutes later a new message could be sent to the user, but the userwould not receive that message until the next time the user fetches theuser data items. Thus, a user may fail to respond to an emergency updateor message because the user only periodically synchronizes the system,such as once per day. Other problems with these systems include: (1) theamount of data to be reconciled between the host and the mobile devicecan become large if the user does not “synchronize” on a daily or hourlybasis, leading to bandwidth difficulties, particularly when the mobiledevice is communicating via a wireless packet-switched network; and (2)reconciling large amounts of data, as can accrue in these batch-modesynchronization systems, can require a great deal of communicationbetween the host and the mobile device, thus leading to a more complex,costly and energy-inefficient system. A more automated, continuous,efficient and reliable system of ensuring that user data items arereplicated at the user's mobile device is therefore needed.

An additional feature of the present invention is that the pushparadigm, in combination with a return communications pathway, lendsitself well to a system that permits a user to control remotely, throughthe user's mobile device, a number of aspects of the host system.

There remains a general need in this art for a system and method ofcontinuously pushing user-selected data items (or certain portions ofthe selected data items) stored at a host system to a user's mobile datacommunication device.

There remains a more particular need for such a system and method whereuser-selected data items are continuously “pushed” from the host systemto the mobile data communication device upon the occurrence of one ormore user-defined triggering events.

There remains an additional need for such a system and method thatprovides flexibility in the types and quantities of user data items thatare pushed from the host system to the mobile data communication deviceand that also provides flexibility in the configuration and types ofevents that can serve to trigger the redirection of the user data items.

There remains yet an additional need for such a system and method thatcan operate locally on a user's desktop PC or at a distance via anetwork server.

There remains still another need for such a system and method thatprovides for secure, transparent delivery of the user-selected dataitems from the host system to the mobile device.

SUMMARY OF THE INVENTION

The present invention overcomes the problems noted above and satisfiesthe needs in this field for a system and method of pushing user-selecteddata items from a host system to a user's mobile data communicationdevice upon detecting the occurrence of one or more user-defined eventtriggers. As used in this application, the term host system refers tothe computer where the redirector software is operating. In thepreferred embodiment of the present invention, the host system is auser's desktop PC, although, alternatively, the host system could be anetwork server connected to the user's PC via a local-area network(“LAN)”, or could be any other system that is in communication with theuser's desktop PC.

A redirector program operating at the host system enables the user toredirect or mirror certain user-selected data items (or parts of dataitems) from the host system to the user's mobile data communicationdevice upon detecting that one or more user-defined triggering eventshas occurred. Also operating at the host system are various sub-systemsthat can be configured to create triggering events, such as a screensaver sub-system or a keyboard sub-system, as well as sub-systems forrepackaging the user's data items for transparent delivery to the mobiledata device, such as a TCP/IP sub-system or one or more E-Mailsub-systems. Other sub-systems for creating triggering events andrepackaging the user's data items could also be present at the hostsystem. The host system also includes a primary memory store where theuser's data items are normally stored.

Using the redirector program, the user can select certain data items forredirection, such as E-mail messages, calendar events, meetingnotifications, address entries, journal entries, personal reminders etc.Having selected the data items for redirection, the user can thenconfigure one or more event triggers to be sensed by the redirectorprogram to initiate redirection of the user data items. Theseuser-defined trigger points (or event triggers) include external events,internal events and networked events. Examples of external eventsinclude: receiving a message from the user's mobile data communicationdevice to begin redirection; receiving a similar message from someexternal computer; sensing that the user is no longer in the vicinity ofthe host system; or any other event that is external to the host system.Internal events could be a calendar alarm, screen saver activation,keyboard timeout, programmable timer, or any other user-defined eventthat is internal to the host system. Networked events are user-definedmessages that are transmitted to the host system from another computercoupled to the host system via a network to initiate redirection. Theseare just some of the examples of the types of user-defined events thatcan trigger the redirector program to push data items from the host tothe mobile device. Although in the preferred embodiment it isanticipated that the configuration that specifies which data items willbe redirected and in what form will be set at the host system, it iswithin the scope of this invention that such configuration may be set ormodified through data sent from the mobile communications device.

In addition to the functionality noted above, the redirector programprovides a set of software-implemented control functions for determiningthe type of mobile data communication device and its address, forprogramming a preferred list of message types that are to be redirected,and for determining whether the mobile device can receive and processcertain types of message attachments, such as word processor or voiceattachments. The determination of whether a particular mobile device canreceive and process attachments is initially configured by the user ofthat mobile device at the host system. This configuration can be alteredon a global or per message basis by transmitting a command message fromthe mobile device to the host system. If the redirector is configured sothat the mobile data device cannot receive and process word processor orvoice attachments, then the redirector routes these attachments to anexternal machine that is compatible with the particular attachment, suchas an attached printer or networked fax machine or telephone. Othertypes of attachments could be redirected to other types of externalmachines in a similar fashion, depending upon the capabilities of themobile device. For example, if a user is traveling and receives amessage with an attachment that the user's mobile device can process ordisplay, the user may from a mobile communications device send a commandmessage to the host system indicating that that attachment is to be sentto a fax machine at a hotel where the user will be spending the evening.This enables the user to receive important E-mail attachments as long asthe host system is provided with sufficient information about thedestination where the attachment is to be forwarded.

Once an event has triggered redirection of the user data items, the hostsystem then repackages these items in a manner that is transparent tothe mobile data communication device, so that information on the mobiledevice appears similar to information on the user's host system. Thepreferred repackaging method includes wrapping the user data items in anE-mail envelope that corresponds to the address of the mobile datacommunication device, although, alternatively, other repackaging methodscould be used with the present invention, such as special-purpose TCP/IPwrapping techniques, or other methods of wrapping the user selected dataitems. The repackaging preferably results in E-mail messages generatedby the user from the mobile device to be transmitted from the hostsystem, thus enabling the user to appear to have a single E-mailaddress, such that the recipients of messages sent from the mobilecommunications device do not know where the user was physically locatedwhen the message was first sent. The repackaging also permits bothmessages to the mobile device and sent from the mobile device to beencrypted and decrypted as well as compressed and decompressed.

In an alternative system and method, the redirector program executes ona network server, and the server is programmed to detect numerousredirection event triggers over the network from multiple user desktopcomputers coupled to the server via a LAN. The server can receiveinternal event triggers from each of the user desktops via the network,and can also receive external event triggers, such as messages from theusers' mobile data communication devices. In response to receiving oneof these triggers, the server redirects the user's data items to theproper mobile data communication device. The user data items andaddressing information for a particular mobile device can be stored atthe server or at the user's PC. Using this alternative configuration,one redirector program can serve a plurality of users. This alternativeconfiguration could also include an internet- or intranet-basedredirector program that could be accessible through a secure webpage orother user interface. The redirector program could be located on anInternet Service Provider's system and accessible only through theInternet.

In another alternative configuration of the present invention, aredirector program operates at both the host system and at the user'smobile data communication device. In this configuration, the user'smobile device operates similarly to the host system described below, andis configured in a similar fashion to push certain user-selected dataitems from the mobile device to the user's host system (or some othercomputer) upon detecting an event trigger at the mobile device. Thisconfiguration provides two-way pushing of information from the host tothe mobile device and from the mobile device to the host.

The primary advantage of the present invention is that it provides asystem and method for triggering the continuous and real-timeredirection of user-selected data items from a host system to a mobiledata communication device. Other advantages of the present inventioninclude: (1) flexibility in defining the types of user data to redirect,and in defining a preferred list of message types that are to beredirected or preferred senders whose messages are to be redirected; (2)flexibility in configuring the system to respond to numerous internal,external and networked triggering events; (3) transparent repackaging ofthe user data items in a variety of ways such that the mobile datacommunication device appears as though it were the host system; (4)integration with other host system components such as E-mail, TCP/IP,keyboard, screen saver, webpages and certain programs that can eithercreate user data items or be configured to provide trigger points; and(5) the ability to operate locally on a user's desktop system or at adistance via a network server.

These are just a few of the many advantages of the present invention, asdescribed in more detail below. As will be appreciated, the invention iscapable of other and different embodiments, and its several details arecapable of modifications in various respects, all without departing fromthe spirit of the invention. Accordingly, the drawings and descriptionof the preferred embodiments set forth below are to be regarded asillustrative in nature and not restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention satisfies the needs noted above as will becomeapparent from the following description when read in conjunction withthe accompanying drawings wherein:

FIG. 1 is a system diagram showing the redirection of user data itemsfrom a user's desktop PC (host system) to the user's mobile datacommunication device, where the redirector software is operating at theuser's desktop PC.

FIG. 2 is a system diagram showing the redirection of user data itemsfrom a network server (host system) to the user's mobile datacommunication device, where the redirector software is operating at theserver.

FIG. 3 is a block diagram showing the interaction of the redirectorsoftware with other components of the host system in FIG. 1 (the user'sdesktop PC) to enable the pushing of information from the host system tothe user's mobile data communication device.

FIG. 4 is a flow chart showing the steps carried out by the redirectorsoftware operating at the host system.

FIG. 5 is a flow chart showing the steps carried out by the mobile datacommunication device to interface with the redirector software operatingat the host system.

DETAILED DESCRIPTION OF THE DRAWINGS

Referring now to the drawings, FIG. 1 is an example system diagramshowing the redirection of user data items (such as message A or C) froma user's office PC (host system) 10 to the user's mobile datacommunication device 24, where the redirector software 12 is operatingat the user's PC. Message A in FIG. 1 represents an internal messagesent from desktop 26 to the user's host system 10 via LAN 14. Message Cin FIG. 1 represents an external message from a sender that is notdirectly connected to LAN 14, such as the user's mobile datacommunication device 24, some other user's mobile device (not shown), orany user connected to the Internet 18. Message C also represents acommand message from the user's mobile data communication device 24 tothe host system 10. As described in more detail in FIG. 3, the hostsystem 10 preferably includes, along with the typical hardware andsoftware associated with a workstation or desktop computer, theredirector program 12, a TCP/IP subsystem 42, a primary message store40, an E-mail subsystem 44, a screen saver subsystem 48, and a keyboardsubsystem 46.

In FIG. 1, the host system 10 is the user's desktop system, typicallylocated in the user's office. The host system 10 is connected to a LAN14, which also connects to other computers 26, 28 that may be in theuser's office or elsewhere. The LAN 14, in turn, is connected to a widearea network (“WAN”) 18, preferably the Internet, which is defined bythe use of the Transmission Control Protocol/Internet Protocol(“TCP/IP”) to exchange information, but which, alternatively could beany other type of WAN. The connection of the LAN 14 to the WAN 18 is viahigh bandwidth link 16, typically a T1 or T3 connection. The WAN 18 inturn is connected to a variety of gateways 20, via connections 32. Agateway forms a connection or bridge between the WAN 18 and some othertype of network, such as an RF wireless network, cellular network,satellite network, or other synchronous or asynchronous land-lineconnection.

In the example of FIG. 1, a wireless gateway 20 is connected to theInternet for communicating via wireless link 22 to a plurality ofwireless mobile data communication devices 24. Also shown in FIG. 1 ismachine 30, which could be a FAX machine, a printer, a system fordisplaying images (such as video) or a machine capable of processing andplaying audio files, such as a voice mail system. The present inventionincludes the ability to redirect certain message attachments to such anexternal machine 30 if the redirector program configuration datareflects that the mobile device 24 cannot receive and process theattachments, or if the user has specified that certain attachments arenot to be forwarded to mobile device 24, even if such device can processthose attachments. By way of example, consider an E-mail sent to a userthat includes three attachments—a word processing document, a video clipand an audio clip. The redirection program could be configured to sendthe text of the E-mail to the remote device, to send the word processingdocument to a networked printer located near the user, to send the videoclip to a store accessible through a secure connection through theinternet and to send the audio clip to the user's voice mail system.This example is not intended to limit the breadth and scope of theinvention, but rather to illustrate the variety of possibilitiesembodied in the redirection concept.

The preferred mobile data communication device 24 is a hand-held two-waywireless paging computer, a wirelessly enabled palm-top computer, amobile telephone with data messaging capabilities, or a wirelesslyenabled laptop computer, but could, alternatively be other types ofmobile data communication devices capable of sending and receivingmessages via a network connection 22. Although it is preferable for thesystem to operate in a two-way communications mode, certain aspects ofthe invention could be beneficially used in a “one and one-half” oracknowledgment paging environment, or even with a one-way paging system.The mobile data communication device 24 includes software programinstructions that work in conjunction with the redirector program 12 toenable the seamless, transparent redirection of user-selected dataitems. FIG. 4 describes the basic method steps of the redirector program12, and FIG. 5 describes the steps of the corresponding programoperating at the mobile device 24.

In an alternative embodiment of the present invention, not explicitlyshown in the drawings, the mobile device 24 also includes a redirectorprogram. In this embodiment, user selected data items can be replicatedfrom the host to the mobile device and vice versa. The configuration andoperation of the mobile device 24 having a redirector program is similarto that described herein with respect to FIGS. 1-4.

A user of the present invention can configure the redirector program 12to push certain user-selected data items to the user's mobile datacommunication device 24 when the redirector 12 detects that a particularuser-defined event trigger (or trigger point) has taken place.User-selected data items preferably include E-mail messages, calendarevents, meeting notifications, address entries, journal entries,personal alerts, alarms, warnings, stock quotes, news bulletins, etc.,but could, alternatively, include any other type of message that istransmitted to the host system 10, or that the host system 10 acquiresthrough the use of intelligent agents, such as data that is receivedafter the host system 10 initiates a search of a database or a websiteor a bulletin board. In some instances, only a portion of the data itemis transmitted to the mobile device 24 in order to minimize the amountof data transmitted via the wireless network 22. In these instances, themobile device 24 can optionally send a command message to the hostsystem to receive more or all of the data item if the user desires toreceive it.

Among the user-defined event triggers that can be detected by theredirector program 12 are in the preferred embodiment external events,internal events and networked events. External events preferablyinclude: (1) receiving a command message (such as message C) from theuser's mobile data communication device to begin redirection, or toexecute some other command at the host, such as a command to enable thepreferred list mode, or to add or subtract a particular sender from thepreferred list; (2) receiving a similar message from some externalcomputer; and (3) sensing that the user is no longer in the vicinity ofthe host system; although, alternatively, an external event can be anyother detectable occurrence that is external to the host system.Internal events could be a calendar alarm, screen saver activation,keyboard timeout, programmable timer, or any other user-defined eventthat is internal to the host system. Networked events are user-definedmessages that are transmitted to the host system from another computercoupled to the host system via a network to initiate redirection. Theseare just some of the events that could be used with the presentinvention to initiate replication of the user-selected data items fromthe host system 10 to the mobile device 24.

FIG. 1 shows an E-mail message A being communicated over LAN 14 fromcomputer 26 to the user's desktop system 10 (also shown in FIG. 1 is anexternal message C, which could be an Email message from an Internetuser, or could be a command message from the user's mobile device 24).Once the message A (or C) reaches the primary message store of the hostsystem 10, it can be detected and acted upon by the redirection software12. The redirection software 12 can use many methods of detecting newmessages. The preferred method of detecting new messages is usingMicrosoft's® Messaging API (MAPI), in which programs, such as theredirector program 12, register for notifications or ‘advise syncs’ whenchanges to a mailbox take place. Other methods of detecting new messagescould also be used with the present invention.

Assuming that the redirector program 12 is activated, and has beenconfigured by the user (either through the sensing of an internal,network or external event) to replicate certain user data items(including messages of type A or C) to the mobile device 24, when themessage A is received at the host system 10, the redirector program 12detects its presence and prepares the message for redirection to themobile device 24. In preparing the message for redirection, theredirector program 12 could compress the original message A, couldcompress the message header, or could encrypt the entire message A tocreate a secure link to the mobile device 24.

Also programmed into the redirector 12 is the address of the user'smobile data communication device 24, the type of device, and whether thedevice 24 can accept certain types of attachments, such as wordprocessing or voice attachments. If the user's type of mobile devicecannot accept these types of attachments, then the redirector 12 can beprogrammed to route the attachments to a fax or voice number where theuser is located using an attached fax or voice machine 30.

The redirector may also be programmed with a preferred list mode that isconfigured by the user either at the host system 10, or remotely fromthe user's mobile data communication device by transmitting a commandmessage C. The preferred list contains a list of senders (other users)whose messages are to be redirected or a list of message characteristicsthat determine whether a message is to be redirected. If activated, thepreferred list mode causes the redirector program 12 to operate like afilter, only redirecting certain user data items based on whether thedata item was sent from a sender on the preferred list or has certainmessage characteristics that if present will trigger or suppressredirection of the message. In the example of FIG. 1, if desktop system26 was operated by a user on the preferred list of host system 10, andthe preferred list option was activated, then message A would beredirected. If, however, desktop 26 was operated by a user not on thehost system's preferred list, then message A would not be redirected,even if the user of the host system had configured the redirector topush messages of type A. The user of the host system 10 can configurethe preferred list directly from the desktop system, or, alternatively,the user can then send a command message (such as C) from the mobiledevice 24 to the desktop system 10 to activate the preferred list mode,or to add or delete certain senders or message characteristics from thepreferred list that was previously configured. It should be appreciatedthat a redirection program could combine message characteristics andpreferred sender lists to result in a more finely-tuned filter. Messagesmarked as low priority or that are simple return receipts or messageread receipts, for example, could always be suppressed from redirectionwhile messages from a particular sender would always be redirected.

After the redirector has determined that a particular message should beredirected, and it has prepared the message for redirection, thesoftware 12 then sends the message A to a secondary memory store locatedin the mobile device 24, using whatever means are necessary. In thepreferred embodiment this method is to send the message A back over theLAN 14, WAN 18, and through the wireless gateway 20 to the mobile datacommunication device 24. In doing so, the redirector preferablyrepackages message A as an E-mail with an outer envelope B that containsthe addressing information of the mobile device 24, although alternativerepackaging techniques and protocols could be used, such as a TCP/IPrepackaging and delivery method (most commonly used in the alternativeserver configuration shown in FIG. 2). The wireless gateway 20 requiresthis outer envelope information B in order to know where to send theredirected message A. Once the message (A in B) is received by themobile device 24, the outer envelope B is removed and the originalmessage A is placed in the secondary memory store within the mobiledevice 24. By repackaging and removing the outer envelope in thismanner, the present invention causes the mobile computer 24 to appear tobe at the same physical location as the host system 10, thus creating atransparent system.

In the case where message C is representative of an external messagefrom a computer on the Internet 18 to the host system 10, and the host10 has been configured to redirect messages of type C, then in a similarmanner to message A, message C would be repackaged with an outerenvelope B and transmitted to the user's mobile device 24. In the casewhere message C is representative of a command message from the user'smobile device 24 to the host system 10, the command message C is notredirected, but is acted upon by the host system 10.

If the redirected user data item is an E-mail message, as describedabove, the user at the mobile device 24 sees the original subject,sender's address, destination address, carbon copy and blind carboncopy. When the user replies to this message, or when the user authors anew message, the software operating at the mobile device 24 adds asimilar outer envelope to the reply message (or the new message) tocause the message to be routed first to the user's host system 10, whichthen removes the outer envelope and redirects the message to the finaldestination, such as back to computer 26. In the preferred embodiment,this results in the outgoing redirected message from the user's hostsystem 10 being sent using the E-mail address of the host mailbox,rather than the address of the mobile device, so that it appears to therecipient of the message that the message originated from the user'sdesktop system 10 rather than the mobile data communication device. Anyreplies to the redirected message will then be sent to the desktopsystem 10, which if it is still in redirector mode, will repackage thereply and resend it to the user's mobile data device, as describedabove.

FIG. 2 is an alternative system diagram showing the redirection of userdata items from a network server 11 to the user's mobile datacommunication device 24, where the redirector software 12 is operatingat the server 11. This configuration is particularly advantageous foruse with message servers such as Microsoft's® Exchange Server, which isnormally operated so that all user messages are kept in one centrallocation or mailbox store on the server instead of in a store withineach user's desktop PC. This configuration has the additional advantageof allowing a single system administrator to configure and keep track ofall users having messages redirected. If the system includes encryptionkeys, these too can be kept at one place for management and updatepurposes.

In this alternative configuration, server 11 preferably maintains a userprofile for each user's desktop system 10, 26, 28, including informationsuch as whether a particular user can have data items redirected, whichtypes of message and information to redirect, what events will triggerredirection, the address of the users' mobile data communication device24, the type of mobile device, and the user's preferred list, if any.The event triggers are preferably detected at the user's desktop system10, 26, 28 and can be any of the external, internal or network eventslisted above. The desktop systems 10, 26, 28 preferably detect theseevents and then transmit a message to the server computer 11 via LAN 14to initiate redirection. Although the user data items are preferablystored at the server computer 11 in this embodiment, they could,alternatively, be stored at each user's desktop system 10, 26, 28, whichwould then transmit them to the server computer 11 after an event hastriggered redirection.

As shown in FIG. 2, desktop system 26 generates a message A that istransmitted to and stored at the host system 11, which is the networkserver operating the redirector program 12. The message A is for desktopsystem 10, but in this embodiment, user messages are stored at thenetwork server 11. When an event occurs at desktop system 10, an eventtrigger is generated and transmitted to the network server 11, whichthen determines who the trigger is from, whether that desktop hasredirection capabilities, and if so, the server (operating theredirector program) uses the stored configuration information toredirect message A to the mobile computer 24 associated with the user ofdesktop system 10.

As described above with reference to FIG. 1, message C could be either acommand message from a user's mobile data communication device 24, or itcould be a message from an external computer, such as a computerconnected to the Internet 18. If the message C is from an Internetcomputer to the user's desktop system 10, and the user has redirectioncapabilities, then the server 11 detects the message C, repackages itusing electronic envelope B, and redirects the repackaged message (C inB) to the user's mobile device 24. If the message C is a command messagefrom the user's mobile device 24, then the server 11 simply acts uponthe command message.

Turning now to FIG. 3, a block diagram showing the interaction of theredirector software 12 with additional components of the host system 10of FIG. 1 (the desktop PC) to enable more fully the pushing ofinformation from the host system 10 to the user's mobile datacommunication device 24 is set forth. These additional components areillustrative of the type of event-generating systems that can beconfigured and used with the redirector software 12, and of the type ofrepackaging systems that can be used to interface with the mobilecommunication device 24 to make it appear transparent to the user.

The desktop system 10 is connected to LAN 14, and can send and receivedata, messages, signals, event triggers, etc., to and from other systemsconnected to the LAN 14 and to external networks 18, 22, such as theInternet or a wireless data network, which are also coupled to the LAN14. In addition to the standard hardware, operating system, andapplication programs associated with a typical microcomputer orworkstation, the desktop system 10 includes the redirector program 12, aTCP/IP sub-system 42, an E-mail sub-system 44, a primary data storagedevice 40, a screen saver sub-system 48, and a keyboard sub-system 46.The TCP/IP and E-mail subsystems 42, 44 are examples of repackagingsystems that can be used to achieve the transparency of the presentinvention, and the screen saver and keyboard sub-systems 46, 48 areexamples of event generating systems that can be configured to generateevent messages or signals that trigger redirection of the user selecteddata items.

The method steps carried out by the redirector program 12 are describedin more detail in FIG. 4. The basic functions of this program are: (1)configure and setup the user-defined event trigger points that willstart redirection; (2) configure the types of user data items forredirection and optionally configure a preferred list of senders whosemessages are to be redirected; (3) configure the type and capabilitiesof the user's mobile data communication device; (4) receive messages andsignals from the repackaging systems and the event generating systems;and (5) command and control the redirection of the user-selected dataitems to the mobile data communication device via the repackagingsystems. Other functions not specifically enumerated could also beintegrated into this program.

The E-Mail sub-system 44 is the preferred link to repackaging theuser-selected data items for transmission to the mobile datacommunication device 24, and preferably uses industry standard mailprotocols, such as SMTP, POP, IMAP, MIME and RFC-822, to name but a few.The E-Mail sub-system 44 can receive messages A from external computerson the LAN 14, or can receive messages C from some external network suchas the Internet 18 or a wireless data communication network 22, andstores these messages in the primary data store 40. Assuming that theredirector 12 has been triggered to redirect messages of this type, theredirector detects the presence of any new messages and instructs theE-Mail system 44 to repackage the message by placing an outer wrapper Babout the original message A (or C), and by providing the addressinginformation of the mobile data communication device 24 on the outerwrapper B. As noted above, this outer wrapper B is removed by the mobiledevice 24, and the original message A (or C) is then recovered, thusmaking the mobile device 24 appear to be the desktop system 10.

In addition, the E-Mail sub-system 44 receives messages back from themobile device 24 having an outer wrapper with the addressing informationof the desktop system 10, and strips this information away so that themessage can be routed to the proper sender of the original message A (orC). The E-Mail sub-system also receives command messages C from themobile device 24 that are directed to the desktop system 10 to triggerredirection or to carry out some other function. The functionality ofthe E-Mail sub-system 44 is controlled by the redirector program 12.

The TCP/IP sub-system 42 is an alternative repackaging system. Itincludes all of the functionality of the E-Mail sub-system 44, butinstead of repackaging the user-selected data items as standard E-mailmessages, this system repackages the data items using special-purposeTCP/IP packaging techniques. This type of special-purpose sub-system isuseful in situations where security and improved speed are important tothe user. The provision of a special-purpose wrapper that can only beremoved by special software on the mobile device 24 provides the addedsecurity, and the bypassing of E-mail store and forward systems canimprove speed and real-time delivery.

As described previously, the present invention can be triggered to beginredirection upon detecting numerous external, internal and networkedevents, or trigger points. Examples of external events include:receiving a command message from the user's mobile data communicationdevice 24 to begin redirection; receiving a similar message from someexternal computer; sensing that the user is no longer in the vicinity ofthe host system; or any other event that is external to the host system.Internal events could be a calendar alarm, screen saver activation,keyboard timeout, programmable timer, or any other user-defined eventthat is internal to the host system. Networked events are user-definedmessages that are transmitted to the host system from another computerthat is connected to the host system via a network to initiateredirection.

The screen saver and keyboard sub-systems 46, 48 are examples of systemsthat are capable of generating internal events. Functionally, theredirector program 12 provides the user with the ability to configurethe screen saver and keyboard systems so that under certain conditionsan event trigger will be generated that can be detected by theredirector 12 to start the redirection process. For example, the screensaver system can be configured so that when the screen saver isactivated, after, for example, 10 minutes of inactivity on the desktopsystem, an event trigger is transmitted to the redirector 12, whichstarts redirecting the previously selected user data items. In a similarmanner the keyboard sub-system can be configured to generate eventtriggers when no key has been depressed for a particular period of time,thus indicating that redirection should commence. These are just twoexamples of the numerous application programs and hardware systemsinternal to the host system 10 that can be used to generate internalevent triggers.

FIGS. 4 and 5, set forth, respectively, flow charts showing the stepscarried out by the 15 redirector software 12 operating at the hostsystem 10, and the steps carried out by the mobile data communicationdevice 24 in order to interface with the host system. Turning first toFIG. 4, at step 50, the redirector program 12 is started and initiallyconfigured. The initial configuration of the redirector 12 includes: (1)defining the event triggers that the user has determined will triggerredirection; (2) selecting the user data items for redirection; (3)selecting the repackaging sub-system, either standard E-Mail, orspecial-purpose technique; (4) selecting the type of data communicationdevice, indicating whether and what type of attachments the device iscapable of receiving and processing, and inputting the address of themobile device; and (5) configuring the preferred list of user selectedsenders whose messages are to be redirected.

FIG. 4 sets forth the basic steps of the redirector program 12 assumingit is operating at a desktop system 10, such as shown in FIG. 1. If theredirector 12 is operating at a network server 11, as shown in FIG. 2,then additional configuration steps may be necessary to enableredirection for a particular desktop system 10, 26, 28 connected to theserver, including: (1) setting up a profile for the desktop systemindicating its address, events that will trigger redirection, and thedata items that are to be redirected upon detecting an event; (2)maintaining a storage area at the server for the data items; and (3)storing the type of data communication device to which the desktopsystem's data items are to be redirected, whether and what type ofattachments the device is capable of receiving and processing, and theaddress of the mobile device.

Once the redirector program is configured 50, the trigger points (orevent triggers) are enabled at step 52. The program 12 then waits 56 formessages and signals 54 to begin the redirection process. A messagecould be an E-Mail message or some other user data item than may havebeen selected for redirection, and a signal could be a trigger signal,or could be some other type of signal that has not been configured as anevent trigger. When a message or signal is detected, the programdetermines 58 whether it is one of the trigger events that has beenconfigured by the user to signal redirection. If so, then at step 60 atrigger flag is set, indicating that subsequently received user dataitems (in the form of messages) that have been selected for redirectionshould be pushed to the user's mobile data communication device 24.

If the message or signal 54 is not a trigger event, the program thendetermines at steps 62, 68 and 66 whether the message is, respectively,a system alarm 62, an E-Mail message 64, or some other type ofinformation that has been selected for redirection. If the message orsignal is none of these three items, then control returns to step 56,where the redirector waits for additional messages 54 to act upon. If,however the message is one of these three types of information, then theprogram 12 determines, at step 68, whether the trigger flag has beenset, indicating that the user wants these items redirected to the mobiledevice. If the trigger flag is set, then at step 70, the redirector 12causes the repackaging system (E-Mail or TCP/IP) to add the outerenvelope to the user data item, and at step 72 the repackaged data itemis then redirected to the user's mobile data communication device 24 viaLAN 14, WAN 18, wireless gateway 20 and wireless network 22. Controlthen returns to step 56 where the program waits for additional messagesand signals to act upon. Although not shown explicitly in FIG. 4, afterstep 68, the program could, if operating in the preferred list mode,determine whether the sender of a particular data item is on thepreferred list, and if not, then the program would skip over steps 70and 72 and proceed directly back to step 56. If the sender was on thepreferred list, then control would similarly pass to steps 70 and 72 forrepackaging and transmission of the message from the preferred listsender.

FIG. 5 sets forth the method steps carried out by the user's mobile datacommunication device 24 in order to interface to the redirector program12 of the present invention. At step 80 the mobile software is startedand the mobile device 24 is configured to operate with the system of thepresent invention, including, for example, storing the address of theuser's desktop system 10.

At step 82, the mobile device waits for messages and signals 84 to begenerated or received. Assuming that the redirector software 12operating at the user's desktop system 10 is configured to redirect uponreceiving a message from the user's mobile device 24, at step 86, theuser can decide to generate a command message that will startredirection. If the user does so, then at step 88 the redirectionmessage is composed and sent to the desktop system 10 via the wirelessnetwork 22, through the wireless gateway 20, via the Internet 18 to theLAN 14, and is finally routed to the desktop machine 10. In thissituation where the mobile device 24 is sending a message directly tothe desktop system 10, no outer wrapper is added to the message (such asmessage C in FIGS. 1 and 2).

In addition to the redirection signal, the mobile device 24 couldtransmit any number of other commands to control the operation of thehost system, and in particular the redirector program 12. For example,the mobile 24 could transmit a command to put the host system into thepreferred list mode, and then could transmit additional commands to addor subtract certain senders from the preferred list. In this manner, themobile device 24 can dynamically limit the amount of information beingredirected to it by minimizing the number of senders on the preferredlist. Other example commands include: (1) a message to change theconfiguration of the host system to enable the mobile device 24 toreceive and process certain attachments; and (2) a message to instructthe host system to redirect an entire data item to the mobile device inthe situation where only a portion of a particular data item has beenredirected.

Turning back to FIG. 5, if the user signal or message is not a directmessage to the desktop system 10 to begin redirection (or some othercommand), then control is passed to step 90, which determines if amessage has been received. If a message is received by the mobile, andit is a message from the user's desktop 10, as determined at step 92,then at step 94 a desktop redirection flag is set “on” for this message,and control passes to step 96 where the outer envelope is removed.Following step 96, or in the situation where the message is not from theuser's desktop, as determined at step 92, control passes to step 98,which displays the message for the user on the mobile device's display.The mobile unit 24 then returns to step 82 and waits for additionalmessages or signals.

If the mobile device 24 determines that a message has not been receivedat step 90, then control passes to step 100, where the mobile determineswhether there is a message to send. If not, then the mobile unit returnsto step 82 and waits for additional messages or signals. If there is atleast one message to send, then at step 102 the mobile determineswhether it is a reply message to a message that was received by themobile unit. If the message to send is a reply message, then at step108, the mobile determines whether the desktop redirection flag is onfor this message. If the redirection flag is not on, then at step 106the reply message is simply transmitted from the mobile device to thedestination address via the wireless network 22. If, however, theredirection flag is on, then at step 110 the reply message is repackagedwith the outer envelope having the addressing information of the user'sdesktop system 10, and the repackaged message is then transmitted to thedesktop system 10 at step 106. As described above, the redirectorprogram 12 executing at the desktop system then strips the outerenvelope and routes the reply message to the appropriate destinationaddress using the address of the desktop system as the “from” field, sothat to the recipient of the redirected message, it appears as though itoriginated from the user's desktop system rather than the mobile datacommunication device.

If, at step 102, the mobile determines that the message is not a replymessage, but an original message, then control passes to step 104, wherethe mobile determines if the user is using the redirector software 12 atthe desktop system 10, by checking the mobile unit's configuration. Ifthe user is not using the redirector software 12, then the message issimply transmitted to the destination address at step 106. If, however,the mobile determines that the user is using the redirector software 12at the desktop system 10, then control passes to step 110, where theouter envelope is added to the message. The repackaged original messageis then transmitted to the desktop system 10 at step 106, which, asdescribed previously, strips the outer envelope and routes the messageto the correct destination. Following transmission of the message atstep 106, control of the mobile returns to step 82 and waits foradditional messages or signals.

Having described in detail the preferred embodiments of the presentinvention, including the preferred methods of operation, it is to beunderstood that this operation could be carried out with differentelements and steps. This preferred embodiment is presented only by wayof example and is not meant to limit the scope of the present inventionwhich is defined by the following claims.

What is claimed:
 1. A method of redirecting messages between a hostsystem and a mobile data communication device, comprising the steps of:configuring one or more redirection events at the host system; detectingthat a redirection event has occurred at the host system and generatinga redirection trigger; receiving messages directed to a first address atthe host system from a plurality of message senders; in response to theredirection trigger, continuously redirecting the messages from the hostsystem to the mobile data communication device; receiving the messagesat the mobile data communication device; generating reply messages atthe mobile data communication device to be sent to the plurality ofmessage senders and transmitting the reply messages to the host system;receiving the reply messages at the host system and configuring addressinformation of the reply messages such that the reply messages use thefirst address associated with the host system as the originatingaddress, wherein messages generated at either the host system or themobile data communication device share the first address; andtransmitting the reply messages from the host system to the plurality ofmessage senders.
 2. The method of claim 1, further comprising the stepof: storing information regarding the configuration of the mobile datacommunication device at the host system.
 3. The method of claim 2,wherein the configuration information stored at the host systemincludes: (A) the network address of the mobile data communicationdevice; and (B) an indication of the types of message attachments thatthe mobile data communication device can receive and process.
 4. Themethod of claim 3, wherein the configuration information furtherincludes: (C) an indication of the type of mobile data communicationdevice.
 5. The method of claim 3, further comprising the steps of: foreach message to be redirected, the host system determining whether themessage includes an attachment, and if so then determining the type ofattachment; accessing the stored configuration information at the hostsystem to determine whether the mobile data communication device canreceive and process attachments of the determined type; and if so, thenredirecting the attachments to the mobile data communication device, andif not, then redirecting the attachments to a device that is capable ofprocessing the attachment.
 6. The method of claim 5, wherein the type ofattachment is a sound file.
 7. The method of claim 1, wherein thereceived messages are addressed using a sender address and a receiveraddress, the method further comprising the steps of: determining whetherthe receiver address is associated with the mobile data communicationdevice; if the receiver address is associated with the mobile datacommunication device, then determining a network address of the mobiledata communication device and repackaging the messages into electronicenvelopes addressed using the receiver address and the network addressof the mobile data communication device; and after receiving theredirected messages at the mobile data communication device, extractingthe messages from the electronic envelopes and displaying the messagesat the mobile data communication device using the sender address and thereceiver address, so that it appears as though the mobile datacommunication device is the host system.
 8. The method of claim 1,wherein the redirection events include external events, internal events,or networked events.
 9. The method of claim 8, wherein the externalevent is a message from the mobile data communication device to startredirection.
 10. The method of claim 8, wherein the internal event is acalendar alarm.
 11. The method of claim 8, wherein the internal event isa screen saver activation.
 12. The method of claim 8, wherein theinternal event is a keyboard timeout signal.
 13. The method of claim 8,wherein the networked events include messages to begin redirection fromcomputer systems other than the mobile data communication device, whichare connected to the host system via a wired network.
 14. The method ofclaim 1, wherein the mobile data communication device is a pager. 15.The method of claim 1, wherein the mobile data communication device is adevice equipped to receive both voice and non-voice data messages. 16.The method of claim 1, wherein the host system includes a preferred listfor limiting the redirection step to redirecting only those messagesthat are transmitted to the host system from a sender on the preferredlist.
 17. The method of claim 16, wherein a user can add and subtractsenders from the preferred list.
 18. The method of claim 17, wherein theuser can add and subtract senders from the preferred list by configuringthe host system.
 19. The method of claim 17, wherein the user can addand subtract senders from the preferred list by transmitting a commandmessage from the mobile data communication device to the host system.20. The method of claim 16, wherein the preferred list is activated anddeactivated at the host system.
 21. The method of claim 16, wherein thepreferred list is activated and deactivated by a command messagetransmitted from the mobile data communication device to the hostsystem.
 22. A message redirection method operating at a host system,comprising the steps of: associating a first address with the hostsystem; configuring one or more redirection events at the host system;detecting that a redirection event has occurred at the host system andgenerating a redirection trigger; receiving messages at the host systemfrom a plurality of message senders; in response to the redirectiontrigger, continuously redirecting the received messages from the hostsystem to a mobile data communication device associated with the hostsystem; receiving reply messages from the mobile data communicationdevice at the host system and configuring the reply messages using thefirst address associated with the host system as the originatingaddress, wherein messages generated at either the mobile datacommunication device or the host system share the first address; andtransmitting the configured reply messages from the host system to theplurality of message senders.
 23. A message redirection method.comprising the steps of: configuring one or more redirection events at ahost system; detecting that a redirection event has occurred at the hostsystem and generating a redirection trigger; receiving messages at thehost system from a plurality of message senders; in response to theredirection trigger, continuously redirecting the received messages fromthe host system to a mobile data communication device associated withthe host system, wherein a first email address for the user of themobile data communication device is associated with the host system;receiving the redirected messages at the mobile data communicationdevice; generating reply messages at the mobile data communicationdevice; transmitting the reply messages from the mobile datacommunication device to the host system; receiving the reply messages atthe host system and configuring the reply messages using the first emailaddress for the user of the mobile data communication device as theaddress originating the reply messages, wherein messages generated ateither the host system or the mobile data communication device share thefirst email address; and transmitting the configured reply messages fromthe host system to the plurality of message senders.
 24. A computersystem for redirecting messages from a mobile data communication devicecomprising: a host system capable of sending and receiving messages,wherein a message sender's email address is associated with the hostsystem; a redirector component operable with the host system that uponreceiving a message generated at the mobile device, by a message senderdestined for a message recipient, configures address information of thereceived message, prior to redirection to the message recipient, suchthat the received message uses the message sender's email addressassociated with the host system, thereby allowing messages generated ateither the mobile device or host system to share the message sender'semail address associated with the host system.
 25. A computer system asclaimed in claim 24, wherein a from email address field in theconfigured received message is the message sender's email addressassociated with the host system.
 26. A computer system as claimed inclaim 25, wherein a reply-to email address field in the configuredreceived message is the message sender's email address associated withthe host system.
 27. A computer system as claimed in claim 26, furthercomprising a descriptor added to the configured received message toindicate to the message recipient that the message was generated at themobile data communications device instead of the host system.
 28. Amethod for redirecting messages generated at a mobile data communicationdevice by a message sender destined for a message recipient, comprisingthe steps of: receiving a message, generated at the mobile datacommunications device by the message sender destined for the messagerecipient, at a redirector component associated with a host system,wherein messages generated at the host system by the message sender usea first address; configuring address information of the received messagesuch that the received message uses the message sender's first addressas the address originating the message, wherein messages generated ateither the mobile data communications device or host system share themessage sender's first address; and redirecting the configured receivedmessage to the message recipient.
 29. A method as claimed in claim 28,wherein the message sender's first address is an email addressassociated with the host system.
 30. A method as claimed in claim 29,wherein the configuring step ensures a from email address field in theconfigured received message is the message sender's email addressassociated with the host system.
 31. A method as claimed in claim 30,wherein the configuring step ensures a reply-to email address field inthe configured received message is the message sender's email addressassociated with the host system.
 32. A method for redirecting messagesbetween a host system and a mobile data communication device, comprisingthe steps of: configuring one or more redirection events at the hostsystem; detecting that a redirection event has occurred at the hostsystem and generating a redirection trigger; receiving incoming messagesdirected to a first address at the host system from a plurality ofmessage senders, wherein the first address is associated with messagesgenerated at the host system by a user of the mobile data communicationdevice; in response to the redirection trigger, continuously redirectingthe incoming messages from the host system to the mobile datacommunication device; receiving outgoing messages generated at themobile communications device at the host system; configuring addressinformation of the outgoing messages so that the first address is usedas an originating address of the outgoing messages, wherein messagesgenerated at either the mobile data communication device or the hostsystem share the first address; and transmitting the outgoing messagesfrom the host system to message recipients.
 33. A computer readablemedium encoded with software instructions for enabling a method ofredirecting messages generated at a mobile data communication device bya message sender destined for a message recipient, the method comprisingthe steps of: receiving a message, generated at the mobile datacommunications device by the message sender destined for the messagerecipient, at a redirector component associated with a host system,wherein messages generated at the host system by the message sender usea first address; configuring address information of the received messagesuch that the received message uses the message sender's first addressas the address originating the message, wherein messages generated ateither the mobile data communications device or host system share themessage sender's first address; and redirecting the configured receivedmessage to the message recipient.
 34. The method of claim 28, furthercomprising the steps of: configuring one or more redirection events atthe host system; detecting that a redirection event has occurred at thehost system and generating a redirection trigger; and continuouslyredirecting messages received at the host system to the mobile datacommunication device.
 35. The method of claim 34, wherein theredirection event is a screen saver activation signal.
 36. The method ofclaim 34, further comprising the steps of: configuring one or moremessage filters at the host system; and filtering received messages atthe host system using the one or more message filters prior toredirecting messages to the mobile data communication device.